In groups of four or five, demonstrate the concepts of pressure
and friction by completing the following activities.
Pressure: Puncture a two-litre plastic bottle with three equally
small holes: one near the top, one near the middle and one near
the bottom. Three of the group members should each place a thumb
over each of the three holes, while a fourth fills the bottle
with water. Ensure that the three people who are blocking the
holes have graduated cylinders. At the given signal, the three
will simultaneously take their thumbs away from the holes and
catch the draining water with their graduated cylinder. After
a 15 second count, simultaneously they will once again cover the
holes. Record the volume of water in each of the graduated cylinders
- be sure to indicate which hole the water came from.
Friction: Using masking tape, mark off a one-metre distance on
a carpeted surface and another one-metre distance on an uncarpeted
surface. Place a battery-operated car at the starting line on
the carpeted surface and record how much time it takes to cross
the finishing line. (To increase the precision of your data, you
may use a stopwatch.) Repeat this process on the uncarpeted surface.
Please Contact Us to discuss your graduated cylinder
needs. You design it, we build it.